Graphene - Page 4

Researchers from Spain's ICN2, in collaboration with Imec and K.U. Leuven have developed a modified graphene-based nanodevice fabrication technique that can increase the spin lifetime and relaxation length by up to three times.

The researchers used CVD-made graphene grown on a platinum foil. By optimizing several standard processes, the researchers managed to reduce the impurity level of the graphene.

Researchers from two FLEET universities in Australia, RMIT and UNSW, collaborated in a theoretical–experimental project that discovered a previously unseen mode of giant magneto-resistance (GMR) in 2D Fe₃GeTe₂ (FGT). This surprising result suggests a different underlying physical mechanisms in vdW hetero-structures.

The research shows that vdW materials (2D material) could offer higher functionality compared to traditional spintronic approaches.

Researchers from the University of Texas at San Antonio (UTSA) have developed a graphene-based "zero-power" interconnect that can present the loss of spin in Spintronics devices.

In the new architecture, the graphene nanomaterials are used as both the spin transport channel and the tunnel barrier. The researchers use reduced graphene oxide in a single-layer configuration. The researchers discovered that by controlling the amount of oxide on the graphene layers, the tune electrons’ conductivity can be fine-tuned.

EU's Graphene Flagship project researchers fabricated graphene-based spintronics devices that utilize both electron charge and spin at room temperature.

The researchers demonstrated the spin’s feasibility for bridging distances of up to several micrometres - which they say could open the door to single-chip devices that integrate logic and memory.

Researchers from Europe developed heterostructures built from graphene and topological insulators and have shown the strong tunability and suppression of the spin signal and spin lifetime in these structures.

Associate Professor Saroj Prasad Dash from Chalmers University of Technology explains that the advantage of using heterostructures built from two Dirac materials is tha graphene in proximity with topological insulators still supports spin transport, and concurrently acquires a strong spin–orbit coupling.

Roland Kawakami from Ohio State University gave a lecture at Minnesota Nano Center that discusses spintronics in 2D materials, with a focus on graphene materials:

The lecture also includes opto-spintronics, 2D Magnets, and more.

Researchers from Russia, Germany and Spain managed to modify graphene to make the material both magnetic and with spin-orbit interaction, for the first time. This could make graphene suitable for quantum computers.

To achieve these new properties, the researchers combined graphene with gold and cobalt. The spin-orbit interaction, unlike in gold, is extremely small in graphene. The interaction between graphene and gold increases the spin-orbit interaction in graphene, while interaction between graphene and cobalt induced magnetism.

Reserachers from Spain's nanoGUNE Cooperative Research Center (CIC) developed a method to connect magnetic porphyrin molecules to graphene nanoribbons. These connections may be an example of how graphene could enable the potential of molecular electronics.

Magnetic Porphyrin, a molecule that is responsible for making photosynthesis possible in plants and transporting oxygen in the blood, is an interesting spintronics material. The researchers now report that even after injecting electronic currents into the Porphyrin via the graphene wires, the molecule maintains its magnetic property. Small variations in the way the graphene nanoribbons are attached to a molecule can alter its magnetic properties - and the molecule's spin can be manipulated via the injected currents.

Zeila Zanolli,a principal investigator at RWTH Aachen University and the European Theoretical Spectroscopy Facility (ETSF) gave a lecture at the MaX Conference on the Materials Design Ecosystem at the Exascale last month, titled "Spintronics at the interface".

Zeila specifically discusses the interface between Graphene and BaMnO₃ materials.

Researchers from the University of Nebraska-Lincoln designed a spintronics transistor that is based on graphene. The researchers say that such a device could be highly efficient, run at room temperature (and above) and feature a nonvolatile on-off current ratio and electrically controllable spin polarization.

The device is based on the discovery that an external voltage can be used to control the magnetic properties of few-layer graphene interfaced with chromium oxide. This is a theoretical research at this stage but the new device structure is expected to feature a large electrically controllable spin current.